摘要
通过对比充液管道与空管检测中纵向超声导波信号和频散曲线之间的差异,定量描述充液管道检测信号幅值衰减与群速度降低程度,由此得到充液管道所特有的纵向干扰模态及其频率相关性。分析结果表明,通过合理选择的激励信号,能有效调节并抑制该模态对损伤检测的干扰。此外,对比不同损伤程度下空管与充液管间缺陷反射信号幅值特征差异,得到充液管缺陷反射信号的能量耗散程度随缺陷反射信号本身能量的增大而非线性增大的定量关系,数值分析结果与相关实验结果基本吻合。
A study on defects detection of the hollow and liquid-filled pipes was carried out by comparison of their detection signals and dispersion curves.The attenuation of the detection signals amplitude and their group velocity in liquid-filled pipe is described quantitatively,hence the specific disturbance mode in liquid-filled pipes,as well as its frequency dependence,is analyzed.The results show that the disturbance mode can be adjusted and restrained remarkably by choosing some appropriate exciting signs.Furthermore,the difference of the defect reflecting signals with variable damage levels in the hollow and liquid-filled pipes indicates that there is a non linear relationship between the degree of the energy dissipation and the damage degree in the liquid-filled pipes.The present numerical analysis proves a good agreement with the corresponding experiment results.
出处
《机械强度》
CAS
CSCD
北大核心
2011年第1期55-61,共7页
Journal of Mechanical Strength
基金
国家自然科学基金资助项目(10672067)~~
关键词
充液管道
流—固耦合
损伤检测
数值模拟
Liquid-filled pipe
Fluid-solid coupling
Damage detection
Numerical simulation
